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Analog Devices Inc. AD8278BRZ-R7
- Part No.:
- AD8278BRZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8278BRZ-R7.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,754
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Product details
Overview
AD8278BRZ-R7 from Analog Devices is a precision, low-power difference amplifier with fixed gain options of G = ½ or G = 2, 1 MHz bandwidth (G = ½), 80 dB CMRR (dc to 20 kHz), and 200 μA max supply current. It operates from single supplies (2 V to 36 V) or dual supplies (±2 V to ±18 V) and is used in high-common-mode-voltage current sensing and voltage monitoring circuits.
For engineers reviewing the AD8278BRZ-R7 datasheet, AD8278BRZ-R7 pinout, AD8278BRZ-R7 application, or AD8278BRZ-R7 equivalent, this page delivers verified specifications, SOIC-8 package details, real-world use cases in battery-powered instrumentation, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The AD8278BRZ-R7 integrates laser-trimmed thin-film resistors to achieve precise gain accuracy (0.005% typ. gain error) and high common-mode rejection - up to 86 dB at G = 2 - while supporting input voltages extending beyond the supply rails (e.g., ±27 V on ±15 V supplies). Its internal architecture eliminates external resistor matching requirements.
It features rugged input overvoltage protection, enhanced slew rate (1.4 V/μs), and ultra-low drift performance: ±1 μV/°C max offset drift and 1 ppm/°C max gain drift (Grade B). The device is optimized for single-supply operation with reference input (REF) enabling level-shifting and midsupply biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = ½ or G = 2 - factory-configured, no external resistors needed; enables direct interface with shunt-based current sensing or differential voltage measurement. |
| CMRR | 80 dB min (dc–20 kHz, G = ½) - rejects high common-mode noise in motor control or industrial bus monitoring without signal degradation. |
| Supply Current | 200 μA max per amplifier - supports >10-year battery life in portable multimeters and IoT sensor nodes. |
| Bandwidth | 1 MHz (G = ½), 550 kHz (G = 2) - sufficient for DC–500 kHz signal conditioning in power supply feedback and motor phase current sensing. |
| Input Voltage Range | −3(VS + 0.1) V to +3(VS − 1.5) V (G = ½) - accepts inputs up to 3× supply rail, ideal for high-side shunt monitoring in 12 V/24 V automotive systems. |
| Offset Voltage Drift | ±1 μV/°C max (Grade B) - ensures stable baseline in temperature-varying environments like industrial PLC analog input modules. |
| Operating Supply | Single: 2.0 V to 36 V; Dual: ±2 V to ±18 V - compatible with wide-input industrial power rails and low-voltage wearable health monitors. |
Pinout & Package
AD8278BRZ-R7 is housed in an 8-lead SOIC package (body width 3.9 mm, JEDEC MS-012), RoHS-compliant, rated for −40°C to +125°C junction temperature. Thermal resistance θJA = 121°C/W on standard 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REF | Reference voltage input | Sets output common-mode level; tied to ground for single-ended output or to midsupply for rail-to-rail compatible systems. |
| 2 −IN | Inverting input | Connects to low-side of differential source (e.g., shunt resistor return path); high-impedance node with 30 kΩ common-mode input impedance. |
| 3 +IN | Noninverting input | Connects to high-side of differential source (e.g., shunt resistor load side); matched to −IN for CMRR integrity. |
| 4 −VS | Negative supply | Accepts ground (single supply) or negative rail (dual supply); must be ≥2 V below +VS per datasheet Section 7. |
| 5 SENSE | Sense terminal | Provides Kelvin connection to output load; improves accuracy under varying load conditions by eliminating trace resistance error. |
| 6 OUT | Amplified output | Delivers gain-scaled differential input; drives 10 kΩ loads with ±14.8 V swing on ±15 V supplies (−VS + 0.2 V to +VS − 0.2 V). |
| 7 +VS | Positive supply | Primary power rail; supports unbalanced supplies (e.g., −VS = 0 V, +VS = 5 V) as long as +VS − (−VS) ≥ 2 V. |
| 8 NC | No connect | Internally unused; must remain floating - no PCB trace or thermal pad connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range beyond supplies | Supports input common-mode voltages up to ±27 V on ±15 V supplies - enables direct high-side current sensing without level-shifting circuitry. |
| Rugged input overvoltage protection | Withstands −VS + 40 V / +VS − 40 V on any input pin - protects against transients in motor drive and industrial I/O applications. |
| Laser-trimmed internal resistors | Ensures 0.005% typical gain error and <1 ppm/°C gain drift - eliminates manual calibration in production test fixtures and medical sensors. |
| Low power dissipation | 0.5 mW at VS = 2.5 V - allows integration into space-constrained, thermally isolated modules such as handheld calibrators. |
| Enhanced slew rate | 1.4 V/μs - preserves fidelity of fast transient signals (e.g., PWM edge detection in Class-D amplifier feedback loops). |
Applications
| Current Sensing in Motor Drives | Voltage Monitoring in Telecom Power Systems |
|---|---|
Use Scenario: Measuring phase current in 3-phase BLDC motor controllers using high-side shunt resistors. IC Role / Device Role / Timing Role: Difference amplifier configured at G = 2, rejecting bus voltage common-mode while amplifying mV-level shunt drops. Use Value: Enables accurate torque control with <1% gain error across −40°C to +125°C, reducing need for temperature compensation firmware. |
Use Scenario: Monitoring −48 V DC backup supply voltage in telecom base station power distribution units. IC Role / Device Role / Timing Role: G = ½ difference amplifier referenced to system ground, measuring voltage drop across series sense resistor. Use Value: Input range extends to −144 V on −48 V rail (−3 × VS), eliminating external attenuators and improving measurement SNR by 6 dB. |
| Battery Management in Portable Medical Devices | Industrial Process Instrumentation |
Use Scenario: Precision cell voltage monitoring in multi-cell lithium-ion battery packs for infusion pumps. IC Role / Device Role / Timing Role: G = ½ configuration with REF tied to midsupply, enabling rail-to-rail output on 3.3 V single supply. Use Value: 200 μA quiescent current extends battery runtime beyond 12 months in always-on monitoring mode. |
Use Scenario: Isolating and scaling 4–20 mA loop signals in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: G = 2 difference amplifier with REF grounded, converting differential loop voltage to single-ended ADC input. Use Value: 86 dB CMRR at G = 2 suppresses magnetic interference from adjacent AC wiring, meeting IEC 61000-4-4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8276ARZ-R7 | Same G = ½/2 options, but higher supply current (350 μA max) and lower CMRR (70 dB min at G = ½). | Less suitable for ultra-low-power battery designs; better for cost-sensitive industrial controls where 10 dB CMRR margin is acceptable. | Select AD8276ARZ-R7 when board space is constrained and 350 μA supply current is acceptable; verify CMRR meets system noise floor requirements. |
| INA199A2IDR | Fixed G = 100, 500 kHz bandwidth, 150 μA supply current, and integrated 100 kΩ/10 kΩ resistor network. | Optimized for high-gain shunt sensing only; lacks G = ½ option and extended input voltage range beyond supplies. | Choose INA199A2IDR for high-side current sensing above 1 A where G = 100 provides adequate resolution; not interchangeable for voltage monitoring or low-gain applications. |
Compared with AD8278BRZ-R7, AD8276ARZ-R7 trades lower power for reduced precision, while INA199A2IDR offers higher gain but sacrifices configurability and input voltage headroom - making AD8278BRZ-R7 optimal for dual-role (current/voltage) signal conditioning in wide-supply, low-drift systems.
Availability
AD8278BRZ-R7 is available at Aetrix Electronics and suitable for current sensing in motor drives, voltage monitoring in telecom power systems, and battery management in portable medical devices requiring stable component supply and long-term lifecycle support.
Supply support for AD8278BRZ-R7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD8278 is part of Analog Devices' precision difference amplifier product line, engineered for low-power, high-CMRR signal conditioning in space- and energy-constrained applications where accuracy and reliability are critical.
FAQ
What is the maximum input common-mode voltage supported by AD8278BRZ-R7?
The AD8278BRZ-R7 supports input common-mode voltages up to −3(VS + 0.1) V to +3(VS − 1.5) V in G = ½ configuration. For example, with ±15 V supplies, it accepts inputs from −45.3 V to +43.5 V - well beyond the supply rails - enabling direct high-side shunt measurement without external attenuation. This capability is confirmed in Table 2 and Figure 12 of the AD8278/AD8279 Rev. C datasheet.
Can AD8278BRZ-R7 operate from a single 3.3 V supply?
Yes, AD8278BRZ-R7 operates from single supplies as low as 2.0 V. At 3.3 V, it delivers full functionality with G = ½ or G = 2, 870 kHz bandwidth (G = ½), and 200 μA supply current. The REF pin must be biased appropriately - typically to 1.65 V (midsupply) - to ensure linear output swing, as verified in Table 4 and Figure 13 of the datasheet.
Does AD8278BRZ-R7 require external resistors for gain setting?
No, AD8278BRZ-R7 does not require external resistors. Its gain is fixed internally via laser-trimmed thin-film resistors (40 kΩ/20 kΩ ratio for G = ½; 20 kΩ/40 kΩ for G = 2), ensuring 0.005% typical gain error and <1 ppm/°C drift. This eliminates layout sensitivity and matching errors inherent in discrete resistor networks, as detailed in the Functional Block Diagram (Figure 1) and Specifications tables.
What is the purpose of the SENSE pin on AD8278BRZ-R7?
The SENSE pin on AD8278BRZ-R7 provides a Kelvin connection point for the output load, allowing the amplifier to regulate its output voltage directly at the load terminals. This compensates for voltage drop across PCB traces or connectors, preserving gain accuracy under varying load conditions - especially critical in precision current sensing applications with long interconnects.
Is AD8278BRZ-R7 pin-compatible with AD8276 or AD8277?
No, AD8278BRZ-R7 is not pin-compatible with AD8276 or AD8277. While functionally similar as precision difference amplifiers, AD8278BRZ-R7 uses an 8-pin SOIC with dedicated SENSE and REF pins (pinout: REF, −IN, +IN, −VS, SENSE, OUT, +VS, NC), whereas AD8276/AD8277 use different pin assignments and lack the SENSE terminal. Board redesign is required for substitution.
AD8278BRZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 200µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8278BRZ-R7 FAQ
1.How can I place an order for AD8278BRZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8278BRZ-R7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD8278BRZ-R7 reliable?
The price and inventory of AD8278BRZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8278BRZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8278BRZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8278BRZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8278BRZ-R7?
AD8278BRZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8278BRZ-R7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD8278BRZ-R7?
For technical support, including AD8278BRZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8278BRZ-R7 requirements.
6.How does Aetrix verify that AD8278BRZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8278BRZ-R7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD8278BRZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8278BRZ-R7?
All AD8278BRZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8278BRZ-R7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD8278BRZ-R7 part is unused and in its original packaging.
Return procedure for AD8278BRZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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